I'm reading a book bottom up where it said:
The Arithmetic Logic Unit (ALU) is the heart of the CPU operation. It takes values in registers and performs any of the multitude of operations the CPU is capable of. All modern processors have a number of ALUs so each can be working independently. In fact, processors such as the Pentium (*emphasis by me) have both fast and slow ALUs; the fast ones are smaller (so you can fit more on the CPU) but can do only the most common operations, slow ALUs can do all operations but are bigger.
I started to find out how many and found that question https://stackoverflow.com/questions/29056968/how-many-alus-are-in-a-cpu where as far as understood many ALU referred to multi-threading, but
Pentium is single threaded.
Here I've found Are 32-bit ALUs really just 32 1-bit ALUs in parallell?. So I guess what was meant in the book is kind of many parallel "small" ALUs - am I right?